I don't recognize the DT right off the top of my head. I would also do a quick check on DT's from Plate 5 that also only have an inner line at right. I would check Plate 5 first, actually.
For those keeping score at home...I thought my stamp was a type I, "no inner frame lines". So, a type I imperf that isn't Orange Brown, is from plates 4, 6, 7 or 8. That is where I concentrated my search. Lack of experience kept me from considering a type II with, a worn inner line or an inner line right side only.
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